Window pulley



J. F. SHARPLESS, JR.

WINDOW PULLEY.

APPLICATION EILED MAY 10, I921.

1,420, 73, PatentedJune 27,1922.

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JOHN F. SHARPLESS, an, or rrarnannnrnm, PENNSYLVANIA, ASSIGNOR TO THE AMERICAN IE'ULLEY COMPANY, OF EH RATION OF PENNSYLVANIA.

ILADELPHIA, PENNSYLVANIA, A COR-P0- wINnow rULLEY.

Application filed May 10, I921. Serial No. 468,207.

To all whom it may concern:

Be it known that I, JOHN F. SHARPLEss, Jr, a citizen of the United States, residing in Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Window Pulleys, whereof the following is a specification, reference being had to the accompanying drawings.

The invention relates to pulleys of the type commonly employed in windowstructures, and more especially to pulleys adapted to be embedded in concrete or the like.

The main object of my invention is to make it possible to anchor pulleys of the type referred to against displacement in settings of concrete without the use of any separate or special securing means other than afforded by the pulley structure itself.

Other objects and advantages of my invention will become apparent from the detailed description which follows.

In the drawings, Fig. I is a side elevation of a window sash weight of concrete, showing how a pulley constructed in accordance with my invention may be used therewith.

Fig. II is a side elevation of a pulley structure, on a larger scale, conveniently embodying my invention in one form.

Fig. III is a bottom edge view of the same.

Fig. IV shows a cross section of the structure taken as indicated by the line IV-IV in Fig. II, as it appears when embedded in a setting of concrete.

Figs. V, VI and VII are views of a modilied form of my invention similar to Figs.

II, III and IV.

Figs. VIII and IX are a side elevation and a bottom edge view, respectively, of still another modification of my invention.

Fig. X is a fragmentary detail section taken as indicated by the line X-X in Fig. VIII.

Referring first to the form illustrated in Figs. II, III, and IV, the structure there represented comprises a sheave 1, and a protective casing or housing which is com prehensively indicated at 2. This casing, it will be observed, has a substantially semicircular configuration, and envelops practically the whole of the sheave, except for such partial exposure as is necessary to permit entry and exit of the sash cord or chain 3 passing about the sheave as indicated in Flg. I. The casing is made'throughout of sheet metal, and preferably comprises two similar die stamped sections or halves 4:, '5 formed, respectively, with projecting edge flanges 6, 6, which, in the assemblage, abut along the median plane of the structure and together constitute what may be termed a peripheral ridge or fin. Said ridge or fin may, either during the stamping of the sections or subsequently to their assemblage, be deformed or mutilated,-for example, by corrugating as represented in the illustrations to afford protuberances or projections 7 at its opposite sides adapted to serve as anchorages when the structure is embedded in concrete, see Fig. IV.

The casing sections 4, 5 are dished inwardly at the sides asindicated at 8, preferably in con'centri'city' with the'axis of the sheave, and are unitedby atransversely extending tubular rivet member 10, which serves as an axle for the sheave. In its original form, the tubular rivet member 10 is shouldered near its extremities, and the reduced ends thereof, after being inserted through appropriate axially aligned apertures inthe bottoms of the dished depressions 8, 8 casing sections, are upset or headed over to combine said sections into a unitary structure, in the manner clearly illustrated in Fig. IV. If any additional bonding of the casing sections be found desirable, the flanges 6, 6 may be spot welded at intervals, for example. It will be observed that the hollow of the tubular rivet member 10 interconnectsthe dished portions 8, 8 of the casing members and thus affords a through passage into which concrete may initially flow. After hardening, the concrete in the dished portions 8, 8 and in the rivet 10 will assist in retaining the device against displacement.

The sheave 1 may be of any approved construction, but is preferably made of sheet metal. Like the casing 2, it comprises two similar dished sections or halves 11, 12 whose abutting webs may be united either by riveting or by spot welding, as may be found most convenient in practice. The edges of the axial openings of the sheave sections are oppositely flared to embrace and sustain between them a hub sleeve 13, shown to best advantage in Fig. IV.

The embodiment of my invention illustrated in Figs. V, VI and VII is identical with the type just described,-except with regard to the manner of de'iorining or Inntilating the peripheral ridge or fin of the casing member 2. In this embodiment, the ridge or fin is slitted at intervals, and the tabs thus formed are alternately bent, preferably at an inclination, to opposite sides of the median plane of the structure, so as to form and afford appropriate anchorage projections adapted to hold the pulley structure fast in its setting.

Coming, now, to the modification shown in Figs. VIII, IX and X, the flanges 80, of the casing sections 4, 5 take asomewhat different form from those of the other examples. In this modification, the casing members are stamped from blanks which have originally a rectangular outline such as indicated in dotted lines in Fig. VIII. In the course of the die stamping operation, the lower corners 31, 31 of the blank are bent at right angles about a curved line which is concentric with the general curvature of the casing, thus forming laterally extending anchorage tongues, see Fig. X. When the casing parts are assembled as shown, the coordinated pairs of tongues serve as anchorage projections for retaining the pulley structure in place, just as do the projections in the previously described embodiments of my invention.

Any of the several forms of my invention may be incorporated in a concrete sash weight such as shown at 35 in Fig. I, the pulley structure being set in during the melding of the weight. In each instance, it will be seen, the protective casing 4 is suiticiently tight to prevent the concrete from oozing through the line of juncture of its two parts and coming into contact with the sheave.

lVhile I have particularly shown and described my invention as applied to a counterbalancing sash weight, it is obvious that it may equally well be used for other purposes in connection with window structures.

Having thus described my invention, I claim:

1. A window pulley structure comprising, in combination, a sheave; and a protective casing or housing for the sheave, said casing or housing having a peripheral fin deformed to afford projections adapted to serve anchorages when the pulley structure set in concrete or the like.

2. A window pulley structure comprising a sheave housing composed of metal sec-' tions with peripheral flanges united in a ridge or fin deformed to afford projections for anchoring the structure in concrete.

3. A window pulleystructure comprising a sheave housing with a peripheral fin deformed to afford projections at its opposite sides for anchoring the structure in concrete.

4:. A window pulley structure adapted to be set in concrete or the like, and comprising, in combination, a sheave; and a protective casing or housing for the sheave, the sides of said casing or housing having indentations into which the concrete may flow, so as, after hardening, to prevent displacement of the structure.

5. A window pulley structure adapted to be set in concrete or the like, and comprising a sheet metal sheave housing composed of sections dished inward about the sheave axis and united by an axis member headed over on the bottoms of the dished depressions.

6. A window pulley structure adapted to be set in concrete or the like, and comprising, in combination, a sheave; a substantially semicircular protective casing or housing for the sheave consisting of two die stamped sheet metal sections dished inwardly at the sides and having peripheral flanges abutting along the median plane of the structure, said flanges being deformed to afford anchorage projections; and a tubular axle for the sheave extending between and uniting the dished sides of the casing, and providing a through passage into which concrete may flow, so as, after hardening, to assist in preventing displaccment oi the structure.

In testimony whereof, I have hereunto signed my name at Philadelphia, Pennsylvania, this 3rd day of liIay, 1921.

JOHN F. SHARPLESS, JR.

lVitnesses JAMES M. DAVISON, CARRIE TITUS. 

